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drm/vc4: hdmi: Increase audio MAI fifo dreq threshold

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Now we wait for write responses and have a burst
size of 4, we can set the fifo threshold much higher.

Set it to 28 (of the 32 entry size) to keep fifo
fuller and reduce chance of underflow.

Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Reviewed-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240621152055.4180873-8-dave.stevenson@raspberrypi.com
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dom Cobley 2024-06-21 16:20:31 +01:00 committed by Dave Stevenson
parent 014eccc9da
commit 59f8b2b7fb
1 changed files with 13 additions and 5 deletions
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18
drivers/gpu/drm/vc4/vc4_hdmi.c
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@ -2047,6 +2047,7 @@ static int vc4_hdmi_audio_prepare(struct device *dev, void *data,
struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
struct drm_device *drm = vc4_hdmi->connector.dev;
struct drm_connector *connector = &vc4_hdmi->connector;
struct vc4_dev *vc4 = to_vc4_dev(drm);
unsigned int sample_rate = params->sample_rate;
unsigned int channels = params->channels;
unsigned long flags;
@ -2104,11 +2105,18 @@ static int vc4_hdmi_audio_prepare(struct device *dev, void *data,
VC4_HDMI_AUDIO_PACKET_CEA_MASK);
/* Set the MAI threshold */
HDMI_WRITE(HDMI_MAI_THR,
VC4_SET_FIELD(0x08, VC4_HD_MAI_THR_PANICHIGH) |
VC4_SET_FIELD(0x08, VC4_HD_MAI_THR_PANICLOW) |
VC4_SET_FIELD(0x06, VC4_HD_MAI_THR_DREQHIGH) |
VC4_SET_FIELD(0x08, VC4_HD_MAI_THR_DREQLOW));
if (vc4->is_vc5)
HDMI_WRITE(HDMI_MAI_THR,
VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICHIGH) |
VC4_SET_FIELD(0x10, VC4_HD_MAI_THR_PANICLOW) |
VC4_SET_FIELD(0x1c, VC4_HD_MAI_THR_DREQHIGH) |
VC4_SET_FIELD(0x1c, VC4_HD_MAI_THR_DREQLOW));
else
HDMI_WRITE(HDMI_MAI_THR,
VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_PANICHIGH) |
VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_PANICLOW) |
VC4_SET_FIELD(0x6, VC4_HD_MAI_THR_DREQHIGH) |
VC4_SET_FIELD(0x8, VC4_HD_MAI_THR_DREQLOW));
HDMI_WRITE(HDMI_MAI_CONFIG,
VC4_HDMI_MAI_CONFIG_BIT_REVERSE |